R1511 Dual Ethernet Router
Robustel’s R1511 router is a Dual Ethernet port (LAN + WAN) 2G/3G/4G/LTE router with advanced software functions and a dedicated serial port at a very competitive price point.

Cost Effective

The R1511 has been designed with price in mind, able to compete with any other router brand on the market for 4G/LTE connectivity, Serial & Wi-Fi access.

Single Serial Connectivity

Offering either RS232 or RS485 the R1511 offers an incredibly cost-effective option for customers needing LTE connectivity in semi-industrial environments

WAN Failover with 4G/LTE Back-up

An ideal solution for failover for industrial environments or machinery that have a fixed line connection as a primary link like ATM, Vending or Medical equipment.

Secure Remote Access

Support for IPsec, OpenVPN, GRE & RobustVPN allows you to access and communicate with end devices over a secure channel from anywhere in the world.

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R1511 Lite-Industrial Dual Ethernet IoT Router.

The R1511 is a sister product of the R1510 series offering a choice of (3-wire) RS232 or (2-wire) RS485 instead of the Digital Input and Digital Output found on R1510 series.

This means that RS232 and RS485 devices, including Modbus RTU equipment can connect to the internet directly through the R1511 router. The Ethernet port can be independently configured as WAN, LAN1 or LAN2 and Ethernet port 1 as LAN1 or LAN2.

  • Dual Ethernet and choice of RS232 or RS485 port
  • Modbus RTU to Modbus TCP Gateway built-in
  • Ethernet, Wifi and 4G internet connection options with auto-failover
  • Free cloud management platform – RCMS
  • Fully programmable Linux environment with excellent SDK Documentation
  • ‘Smart Reboot’ for enhanced roaming SIM management
  • RobustVPN provides fixed IP address on ANY SIM card
  • Full SMS control for diagnosis and recovery from data network problems
  • Very small footprint for space-constrained applications
  • Wall-mount and DIN-rail mounting options available
Cellular Interface
Number of antennas 2 external antenna(MAIN + AUX)
Connector SMA-K
SIM 1* (3 V & 1.8 V) Standard SIM or eSIM
Ethernet Interface
Number of ports 2 x 10/100 Mbps, 2 x LAN or 1 x LAN + 1 x WAN
Magnet isolation protection 1.5 KV
WiFi Interface
Number of antennas 2 (1 external antenna, 1 PCB antenna)
Connector RP-SMA-K (external antenna)
Standards 802.11b/g/n, supports AP and Client modes
Frequency bands 2.4 GHz
Security WEP, WPA, WPA2
Encryption 64/128 AES, TKIP
Data speed 2*2 MIMO, 300 Mbps
RF output power


(+/-1 dBm)



802.11b                           19 dBm
802.11g                           19 dBm
802.11n (20 MHz)        18 dBm
802.11n (40 MHz)        17 dBm
Receiving sensitivity


(+/-1 dBm)




802.11b                           -93 dBm
802.11g                           -90 dBm
802.11n (20 MHz)        -88 dBm
802.11n (40 MHz)        -85 dBm
Serial Interface
Type 1 x RS-232 or 1 x RS-485 (Hardware configuration)
Connector 3-pin 3.5 mm female socket
Baud rate 300bps to 115200bps
Reset button 1 x RST
LED indicators



1 x RUN, 1 x MDM, 1 x USR, 1 x RSSI, 1 x WLAN
Built-in Watchdog, Timer
Supported programming languages C, C++, Linux Shell scripts
Flash available for SDK 4MB
RAM available for SDK 64MB


Software (Basic features of RobustOS)
Network protocols PPPoE, DHCP , NAT, DNS, NTP, SMTP, Telnet, VLAN,VLAN, VLAN, SSH2, DDNS, etc.
VPN tunnel IPsec, OpenVPN, GRE
Firewall DMZ, anti-DoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control
Management Web, CLI, SMS
App Center (Available Apps for RobustOS)
Apps* L2TP, PPTP, DMVPN, VRRP, QoS, Captive Portal, WLAN Multi AP, SNMP, Language, RCMS
*Request on demand. For more Apps please visit www.robustel.com.
Power Supply and Consumption
Connector 2-pin 3.5 mm female socket
Input voltage 9 to 36V DC
Power consumption Idle: 100 mA@12 V


Data link: 500 mA (peak) @12 V

Physical Characteristics
Ingress protection IP30
Housing & Weight Plastic, 150 g
Dimensions 91.5 x 91.5 x 31.5 mm
Installations Desktop, wall mounting and 35 mm DIN rail mounting
Operating Temperature -25 to +70 °C
Storage Temperature -40 to +85 °C
Relative Humidity 5 to 95% RH
EMI EN 55032: 2012/AC: 2013 (CE & RE) Class B
EMS IEC 61000-4-2 (ESD) Contact Level 2;


IEC 61000-4-3 (RS) Level 2

IEC 61000-4-4 (EFT) Level 2

IEC 61000-4-5 (Surge) Level 2

IEC 61000-4-6 (CS) Level 2

*(In progress)  
*See ordering information for details about other certifications
Model PN Serial Interface LTE Category Frequency Bands* Region/





(* In progress)

4G 3G 2G
R1511-4L-A02EU-A B061701 RS232 CAT4 LTE FDD:



R1511-4L-A02EU-B B061702 RS485
R1511-4L-A03AU-A B061703 RS232 CAT4 LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28



WCDMA: B1/B2/B5/B8 GSM: B2/B3/B5/B8 Australia/


New Zealand

R1511-4L-A03AU-B B061704 RS485
R1511-4L-A07CN-A B061705 RS232 CAT4 LTE FDD: B1/B3/B5/B8


LTE TDD: B34/B38/B39/B40/B41

WCDMA: B1/B8 GSM: B3/B8 China/India  
R1511-4L-A07CN-B B061706 RS485  
R1511-4E-A10CN-A B061707 RS232 CAT1 LTE FDD: B1/B3/B5/B8


LTE TDD: B34/B38/B39/B40/B41

  GSM: B3/B8 China  
R1511-4E-A10CN-B B061708 RS485  
R1511-4L-A05NA-A B061709 RS232 CAT4 LTE FDD:



WCDMA: B2/B4/B5   North America FCC*, Ic*, PTCRB*, ATT*, Verizon*
R1511-4L-A05NA-B B061710 RS485  
R1511-4L-A04JP-A B061711 RS232 CAT4 LTE FDD: B1/B3/B8/B18/B19/B26



WCDMA: B1/B6/B8/B19   Japan TELEC*, JATE*
R1511-4L-A04JP-B B061712 RS485

* Please contact your sales representative for more detailed information on model numbers and for availability of “Global” routers.

All Robustel Firmware and RobustOS Apps are now available to download from the App Centre section of RCMS Cloud.

If you don’t already have access to RCMS you can create a free account at https://rcms-cloud.robustel.net/rcms/index